Ball grinding-mill.



BATBNTBB NOV. 1o, 190B.

M. B. ABBE.

BALL GBINBLNG MILL. APPIIGATION FILED APR. 11, 190B.

3 SHEETS-SHEET 1.

N0 MGDEL.

PATENTED NOV. l0, 1903.

M. F. ABBE.l

BALL GRINDING MILL. A PPLIOATION FILED APR. 1 1, 1903.

a SHEETS-SHEET 2.

N0 MODEL.

ziml'umun PATENTED Nov. 1o, 1903.

M. P, ABB. BALL GRINDING MILL.

APPLIoATmN FILED APR'. 11, 190s.

3 SHEETS-SHEET 3.

N0 MODEL.

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UNITED STATES :A

Patented November 1o, 1eo.

MAX r. nennen New YORK, N. Y.

BALLcRlNolNe-WLL.

SPECIFICATION forming part of Letters Patent No. 743,791, dated November 10, 1903.

Application led April 11,1903. Serial No. 152,137. (No model.)

To all whom it may concern."

lBe it known that I, vMAX F. ABB, a citizen of the United States, residing in New York, borough of Manhattan, and State of New York, have invented certain new and useful Improvements in Ball Grinding-Mills, of which the following is a specication.

This invention relates to improvements in ball grinding-mills in which the coarser particles which cannot pass through the concentric screens of the mill are returnedrto the feed-entrance of the drum by a spiral conveyer in the head of the drum, so as to be subjected again to the grinding action of the balls until the parts are fine enough to pass through the concentric screen and then out at the opposite end of the mill through a spiral conveyer to the delivery end of the mill.

For this purpose the invention consists of a ball grinding-mill, which comprises a rotary drum provided with interior convex bars having wooden cushions and passages between said bars and cushions, screens concentric with the drum, said screens being of coarser and finer mesh, openings in the feed-end head of the drum for delivering the coarser particles not passing through the screens by a spiral conveyer again to the feed-entrance of the drum, openings in the discharge-end head of the drum, and a spiral conveyer for conducting the ground material which passed through the screens to the discharge end of the mill; and the invention consists of certain details of construction and combinations of parts, which will be fully described hereinafter, and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section through my improved ball grinding-mill. Fig. 2 is an end elevation of the ingoing end of the mill. Fig. 3 is a vertical transverse section on line 3 3, Fig. 1, taken in the direction Fig. 4 is an elevation of the mill taken from the discharge end of the same; and Fig. 5 is a vertical transverse section also on line 3 3, Fig. l, but taken in the direction of the arrows 5 5.

Similar letters of reference indicate corre` sponding parts.

Referring to the drawings, A represents the bed-plate of my improved ball grinding-mill, and B the upright standards supported on the same. The standard B at the feed end is provided with a journal-bearing b for the shaft S of the grinding-mill andthe standard B at the discharge end of the mill with a bearing b for the discharge-trunnon T of the mill. To the shaftS is keyed a drum, which is composed of a cylinder D, which is provided with heads D2 and with heads D exterior to and at some distance from the cylinder-heads D2. Between the heads D2 of the cylinder and head D of the drum are arranged spiral conveyers C and C2; The flanges d of the exterior heads D' are fastened by bolts n to the cylinderheads D2, and the cylinder D is fastened to the cylinder-heads D2 by angle-irons g. The cylinder-heads D2 are provided with interiorly-eXtending flanges d', forming annular grooves, in which are fastened transverse easily clog, while the slots cannot clog, as the same are of larger size at their outer circumference than at their inner. The convex bars E form a wave-shaped circumference at the interior of the mill, over'which the grindingballs roll as the mill is turned for grinding the material. As these bars E t into the turned grooves between the flanges d', the bolting of the bars to the cylinder-heads D2 is avoided. These flanges d', forming the annular grooves, are interrupted at a point of their circumference equal to a space corresponding to the width of one of the bars E, so as to permit the insertion and removal of the individual bars. When all the bars E, with the cushions e, have been inserted, the opening is closed by a cap m.

The cylinder-heads D2 are provided with an interior ste lining Z.

The -end 'exterior cover D', cylinderhead D2, and the lining Z are each provided with a central opening, which is lined with a conically-liaring feed-ring H', into which the The I Ico4 neet it with the sleeve S2.

lower end ot' the stationary hopper I-I terminates. The feed-ring H is provided with radial spokes p, which support the same and con- Motion is imparted to the driving-shaft S by a suitable mechanical transmission, as gearing, which is connected with the counter-shaft S', provided with fast and loose pulleysP P' and asuitable power-belt. i

The material to be ground passes from the feed-hopper H through the feed-ring H to the interior of the drum, where itis subjected to the grinding action of the balls passing over the cushioned bars E. The ground material is conducted through the outwardly-tapering 'slotsf between the individual cushion-bars E I toa coarse screen F concentric with the drum.

The ground particles, passing through coarseineshed screens F, are discharged through the same to a second screen F of finer mesh, which is also concentric with the drum. The coarse particles which cannot pass through the screens F are conducted in lateral direction to the side openings o in the feed-end cylinder-head Dzand conducted by the spiral con- Veyer C, located between the cylinder-head Dz and the exterior head D', back to the conical feed-ring lll and from the same again into the drum, while the somewhat smaller particles which passed through the screen F, but are too coarse to pass through the screen F' of somewhat liner mesh, are conducted in lateral direction to the side openings o' in the feed-end cylinder-head D2 and conducted by the spiral'conveyer C back to the conical feed.- ring H and from the same into the drum. The screens are preferably inclined from the discharge end to the face end of the mill, so that the inclination facilitates the return of the coarser particles through the openings o and o' to the spiral conveyer C. The screens are supported on shoulders d3 of the cylinderheads D2 and are arranged in position without being interrupted by cross-bars used in the grinding-mills heretofore to deliver the larger particles to the mill again. rlhevfiner particles which have passed through the finemeshed screen F are collected in the cylinder, which is made of sheet metal and which has preferably a slight inclination from the feed end toward the discharge end of the mill. The discharge-end cylinder-head D2 is provided 'with discharge-openings 02, through which the ground material is discharged toa spiral conveyer C2,which is arranged between the exterior head D and the cylinder-head D2 of the mill, as shown clearly in Fig. l. The spiral conveyer C2 connects at its inner end with an opening in the tubular trunnion T, provided with a conical interior, which discharges the ground material to a suitable conveyer or to vessels placed underneath the same. By the return ofthe coarser particles through the spiral conveyer at the feed-end cylinder and the discharge of the finely-ground particles through the spiral conveyer at the discharge-or delivery head of the cylinder to the discharge-trunnion of the same the mill can be supported close to its bed without being elevated to any great extent for leaving the discharge end free, as was necessary heretofore, while at the same time the grinding of the materialis accomplished in a uniform and effective manner by the use of the spiral conveyers, as described.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A ballgrinding-mill, comprising a drum composed of a cylinder having heads, and provided with heads exterior to and at some distance from the cylinder-heads, a hopper in the feed-end heads of the cylinder, a plurality of transverse steel bars arranged between the heads of the cylinder concentrical to the cylinder, screens between the bars and the cylinder, openings in the feed-end head of the oylinderattheinnerside of thescreens, a spiral conveyer between the feed-end cylinder-head and exterior head, openings in the discharge-end head between the outer screen and cylinder, a spiral conveyer between the discharge-end cylinder and exterior heads, and means .for discharging the ground material at the inner end of the discharge-end spiral conveyer, substantially as set forth.

2. Aball grinding-mill, consisting ofa drum composed of a cylinder provided with heads having interiorly-extending flanges forming annular grooves, and heads exterior to and at some distance from the heads of the cylinder, spiral conveyers between the cylinderheads and the exterior heads, steel bars having convex faces arranged lin said annular grooves, concentric screens of gradually-decreasing mesh encircling said bars, av stationary feed-hopper at the feed end of the mill, openings in the feed-end head of the cylinder between the steel bars and the screen, and between the screens themselves, openings in the discharge-end cylinder-head between the outer screen and the cylinder, and a discharge-trunnion at the discharge end of the mill, substantially as set fort-h.

3. A ball grinding-mill, consisting ofa drum composed of a cylinder provided with heads, having interiorly-extending flanges forming annular grooves, and heads exterior to and at some distance from the cylinder-heads, spiral conveyers between the cylinder-heads and the exterior heads, steel bars having convex faces arranged in said annular grooves, a steel lining at the interior sides of the cylinder-heads, screens concentric to said bars, a supply-hopper at the feed end of the mill, slots between the bars larger at their outer ends than at theirinner, openings in the feedend cylinder-head between the steel bars and the screens and between the screens themselves, openings in the discharge-end cylinder-head between the outer screen and the IOO IIO

cylinder, and a tubular trnnnion at the discharge end of the mill, substantially as set forth.

4. A ball grinding-mill,consisting of a drum Y composed of a cylinder provided with heads, having interiorly extending flanges, and heads exterior to and at some distance from the cylinder-heads, steel bars arranged between the flanges, one next to the other and provided with cushions, concentric screens of gradually-decreasing mesh encircling said bars, a stationary feed-hopper at the feed end of the mill, openings in the feed-end cylinder-head between the bars and the screen, and between the screens themselves, a spiral conveyer between the feed-end cylinder-head and the feed-end exterior head, openings in the discharge-end cylinder-head between the outer screen and the cylinder, a spiral conveyer between the discharge-end cylinderhead and the discharge-end exterior head, and a tubular trunnion for discharging the material passing from the spiral conveyer into the same, substantially as set forth.

5. A ball grinding-mill, consisting of a cylinder provided with heads having exteriorlyextending flanges, and heads exterior to and at some distance from the cylinder-heads, steel bars between said iianges, screens of gradually-increasing mesh concentric to said bars, a sleeve at the feed end of the mill provided with radial spokes, a conically-aring feed-ring supported by said spokes and joined to the feed-end cylinderhead, a stationary hopper terminating in said feed-ring, openings in the feed-end cylinder-head between the bars and the adjacent screen, and between the screens themselves, a conveyer between the feed-end cylinder-head and the feed-end exterior head, openings in the discharge-end cylinder-head and the dischargeend exterior head, and a tubular trunnion for discharging the material fed into the same by the discharge end spiral conveyer, substantially as set forth.

6. In a ball grinding-mill, consisting of a cylinder having steel-lined heads, and heads exterior tothe cylinder and at some distance `from the same, transverse steel bars having convex faces arranged concentrically to said cylindenbetween .the heads of the cylinder, and wooden cushions for said bars, which are arranged one next to the other, so as to leave outwardly-flaring slots between the same,sub stantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses. I

MAX F. ABBE.

Witnesses:

PAUL GOEPEL, HENRY J. SUHRBIER. 

